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We present adaptive optics-assisted integral field spectroscopy around the Haor Hb lines of 12 gravitationally lensed galaxies obtained with VLT/SINFONI,Keck/OSIRIS and Gemini/NIFS. We combine these data with previous observationsand investigate the dynamics and star formation properties of 17 lensedgalaxies at z = 1-4. Thanks to gravitational magnification of 1.4 - 90x byforeground clusters, effective spatial resolutions of 40 - 700 pc are achieved.The magnification also allows us to probe lower star formation rates andstellar masses than unlensed samples; our target galaxies featuredust-corrected SFRs derived from Ha or Hb emission of 0.8 - 40Msol/yr, andstellar masses M* ~ 4e8 - 6e10 Msol. All of the galaxies have velocitygradients, with 59% consistent with being rotating discs and a likely mergerfraction of 29%, with the remaining 12% classed as 'undetermined.' We extract50 star-forming clumps with sizes in the range 60pc - 1kpc from the Ha (or Hb)maps, and find that their surface brightnesses and their characteristicluminosities evolve to higher luminosities with redshift. We show that thisevolution can be described by fragmentation on larger scales in gas-rich discs,and is likely to be driven by evolving gas fractions.

Resolved spectroscopy of gravitationally lensed galaxies: global dynamics and star-forming clumps on ~100pc scales